Factories emit _____ fumes., waste , pollution, toxic, The winds carry the _____ clouds across long distances., polluted , petrol, power, ______ is very harmful to the environment., Solar power , Acid rain, Natural species, Sally is collecting rubbish for _____ in the park., planting , watering, recycling, I can build a _____ box for birds., nesting , nail, gardening, You can't swim here! We have to _____ the pond., clean on , clean out, clean up, Please, take the _____ and pick an apple from the tree., ladder, spade, hammer, Camels live in the, woods , deserts.

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